Salix purpurea vs red willow

Salix purpurea and red willow both are nouns.

Word	Noun	Adjective	Verb	Adverb
Salix purpurea	Yes	No	No	No
red willow	Yes	No	No	No

As nouns, Salix purpurea and red willow are synonyms defined as:

Salix purpurea and red willow: Eurasian osier having reddish or purple twigs and bark rich in tannin

Other synonyms of Salix purpurea include basket willow, purple osier, purple willow, red osier.

Salix purpurea (noun)	red willow (noun)
Eurasian osier having reddish or purple twigs and bark rich in tannin	Eurasian osier having reddish or purple twigs and bark rich in tannin